TenDriver
Member
I don't trim straight wall pistol brass, but saw today in Lyman #49 where they say you should trim 9mm since it head spaces off the mouth.
Anyone do this?
Anyone do this?
Trim 9mm Brass?
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Vodoun da Vinci
Member
I'm a relative newbie with 9mm and have some cases that have been reloaded 5X now. They have not grown and do not need trimmed. So, no, I don't/have never trimmed 9mm brass.
VooDoo
VooDoo
fallout mike
Member
Nope
rcmodel
Member in memoriam
Not in 50 years I haven't.
I trim Magnum revolver brass to get consistent crimps.
Never trimmed an auto-pistol case in my life.
Because it simply isn't necessary.
rc
I trim Magnum revolver brass to get consistent crimps.
Never trimmed an auto-pistol case in my life.
Because it simply isn't necessary.
rc
loose noose
Member
No, I don't trim pistol brass that is designed for a semi-auto.
Otto
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Lyman does not say that you should trim 9mm brass. It says cases trimmed should be uniformed and accurate because it head spaces off the mouth.
sappyg
Member
I trim mine only because they could wind up in a glock. Haven't been willing to take a chance on a long or fat round firing out of battery.
Any thoughts on specically loading 9mm for Glocks?
Any thoughts on specically loading 9mm for Glocks?
rcmodel
Member in memoriam
No.
In spec 9mm is 9mm.
If it's safe to fire in any gun, it's safe to fire in a Glock too.
rc
In spec 9mm is 9mm.
If it's safe to fire in any gun, it's safe to fire in a Glock too.
rc
I have reloaded a ton of 9mm rounds for Glocks, dont trim it, no problems....headspacing off case mouth notwithstanding......
Russellc
Blue68f100
Member
No, never have in nearly 40 yrs.
oldreloader
Member
Mine shrink instead of grow
gamestalker
member
Of all the reloaders I know, and I do know a good few, I'm probably the only one who trims everything I load.
As for whether or not they stretch, with my loads, at the pressures I work around, yes they do grow, and so much so, that I often find them to be more than .010" beyond SAAMI max after the first firing. This is with 9mm and .40 though and wheel gun brass.
GS
As for whether or not they stretch, with my loads, at the pressures I work around, yes they do grow, and so much so, that I often find them to be more than .010" beyond SAAMI max after the first firing. This is with 9mm and .40 though and wheel gun brass.
GS
ArchAngelCD
Member.
In reality most times straight walled pistol brass will shrink slightly when shot and reloaded.
TenDriver
Member
gamestalker
member
Mwaves, why toss a long one out vs just trimming it? It's still a good piece of brass.
GS
GS
tightgroup tiger
Member
I have never seen a 9mm that was over maximum length to begin with.
No, I don't trim them. I do pick out anything under .740"in length.
I use the short ones for shooting in places where I don't get the cases back or for chump giveaways.
No, I don't trim them. I do pick out anything under .740"in length.
I use the short ones for shooting in places where I don't get the cases back or for chump giveaways.
if you are loading free range brass it would be good to check the length.Kurastduuks
Member
Only handgun brass I trim is magnum loads or target revolver ammo. Never had a need to in 9mm
gamestalker
member
Aside from the debate of whether they do, or don't stretch, I have always felt that keeping handgun brass trimmed to the same lengths helps to eliminate issues with inconsistent crimps.
Like many, I have a source for positively once fired factory brass. Often I will find a good deal that is over the SAAMI max, or very close to max, but rarely do I come across anything shorter than SAAMI minimum. And those pieces that I trim to SAAMI trim too length, they have always stretched several thousandths on the first or second time reloaded, but little if any change beyond that point.
Like I said earlier though, this is with the loads I shoot, and from the firearms I shoot them through. Which is to say, I load and shoot mostly high pressure Longshot loads worked up to no less than published maximum. I also don't crimp my cartridges at all, I don't bell the case mouths, and I only load with jacketed bullets, if it matters.
GS
Like many, I have a source for positively once fired factory brass. Often I will find a good deal that is over the SAAMI max, or very close to max, but rarely do I come across anything shorter than SAAMI minimum. And those pieces that I trim to SAAMI trim too length, they have always stretched several thousandths on the first or second time reloaded, but little if any change beyond that point.
Like I said earlier though, this is with the loads I shoot, and from the firearms I shoot them through. Which is to say, I load and shoot mostly high pressure Longshot loads worked up to no less than published maximum. I also don't crimp my cartridges at all, I don't bell the case mouths, and I only load with jacketed bullets, if it matters.
GS
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